Notifications

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Learn about the technical aspects of notification delivery on device, including notification types, priorities, and notification center management.

Notifications Documentation

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iOS 18 Sending Duplicate Push Notifications
When sending a single push notification to iOS 18 devices users receive the same notification multiple times. This issue appears specific to iOS 18 and was not observed in previous iOS versions Our server logs confirm each notification is sent only once. Notification payloads include proper apns-id values for identification and no network issues detected on our side
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98
Jul ’25
Getting VoIP notifications to work and use iOS call UI when phone is locked/app is in background/Not running
Hey there my application allows users to have video calls with each other using Agora. I have successfully set up incoming call functionality on Android but on iOS I am struggling to get the call ui to appear when the app is not running/in background/locked. To my knowledge this is because there is much stricter security on iOS which is limiting me from calling this. When i initially set it up it worked at first when the app was in the background but I think I was failing to report the call to call kit in time and now it's not working. I'm not sure if I need access to this entitlement: com.apple.developer.pushkit.unrestricted-voip Which i believe is only for the big boys or if I make sure I'm reporting the call to call kit fast enough that I won't encounter this issue and it will consistently work in the background.
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235
Mar ’25
Clarification on Timing for Critical Alerts Approval in iOS
We are currently planning the development of an iOS healthcare application that will require the use of Critical Alerts. I understand that these notifications bypass Do Not Disturb and Silent mode, and therefore require special entitlement from Apple. We understand that Critical Alerts require a special entitlement from Apple. Could you please clarify: Do we need to request and obtain Apple’s approval for Critical Alerts before we begin development of the app? Or can we apply for this entitlement after we have a working build or prototype ready? We want to ensure compliance and streamline our development process, so any guidance on the appropriate timing for the entitlement request would be greatly appreciated.
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98
Jul ’25
VOIP is not receiving calls
Hello, I am developing a calling service using CallKit and VOIP push. I have occasionally encountered a strange issue. The issue is that VOIP permanently fails to receive calls. I was previously informed that even if the device is blocked, it can receive calls again after 24 hours. Also, when I checked the device logic, it complied with the policy requirements set by Apple, including correctly calling CallKit's reportNewIncomingCall method. Once the issue occurs, no matter how many times I try, VOIP does not receive calls, and neither a device reboot nor checking the Device Console Log shows any logs related to CallKit or VOIP. I suspect this might be an issue with the VOIP token, and I believe that the only way to get a new one is to reinstall the app. Is that correct? Of course, after reinstalling, it works fine again, but this is very inconvenient. I don't think this is the right solution. Is there anyone who can share their insights on this issue? Thank you.
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239
Mar ’25
Device token not being extracted - iOS app registered for push notifications but callback methods not called
Background: The project was created in Xcode 5, then recreated in new Xcode. Before migration, push notifications worked without issues, after migration device token stopped being extracted. Problem: iOS app registers for push notifications, but didRegisterForRemoteNotificationsWithDeviceToken or didFailToRegisterForRemoteNotificationsWithError methods are not being called. Current situation: App is registered for push notifications (isRegisteredForRemoteNotifications = true) Notification permissions are granted Entitlements are configured correctly (aps-environment: development) Bundle ID: com.autoserviceonline.app Team: BUSINESSVISION COMPANY, TOO (NS3FSG45V7) But callback methods are not being called What I've already tried: Deleted and recreated all App IDs in Apple Developer Portal Cleared Xcode cache and derived data Created new APNs certificates and provisioning profiles Removed "ghost" certificate from Keychain Access Problem persists Additional information: Also noticed that Push Notifications Console opens non-existent project "BV.TestSwiftData" with Personal Team instead of current corporate App ID com.autoserviceonline.app. These issues might be related to project migration from old Xcode. Request: Why iOS doesn't call callback methods for device token, although registration was successful?
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80
Jul ’25
/The notifications/test request was successful, but there were no notification messages from the Apple Store
requestUrl:https://api.storekit-sandbox.itunes.apple.com/inApps/v1/notifications/test method:Post responseCode:200 testNotificationToken:06beba6c-7587-44f6-a4b8-f12b11db6061_1745832671126 Request environment: ①APP from: TestFlight ②Apple acount : Sandbox account ③Apple originalTransactionId: 2000000907966801 App Store sandbox server notification configuration is fine(https://*.com/v2/apple_refund_notify), I have tried many times, but have not received any notification from Apple. Is this API not working?
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143
Apr ’25
Silent Push Notification Handling Behavior
I'm observing that when a silent push notification is sent to our app, is is started up in the background for 30 seconds before being suspended until the app is launched by the user. This causes data to persist from the silent push notification to the user app launch. I couldn't find documentation on this behavior for silent push notifications, and was wondering if it's possible to have the app terminate after handling the silent push notification. Is there documentation on the general flow of silent push notifications as well? I'm able to handle the edge cases if the app has to be suspended until user launch, but just want to confirm that this is the expected behavior before I go about handling it this way.
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118
Apr ’25
Problem receiving Remote Notification in the background after Review Rejected
I created an app. One if its functionalities is receive Remote Notification in the background, while app is monitoring Significant Location Changes (SLC). This functionality worked fine. I was receiving these notifications correctly. Sometimes instantly, sometime with small or large delay. And then I send the app for review. It was rejected with 3 remarks: The app or metadata includes information about third-party platforms that may not be relevant for App Store users, who are focused on experiences offered by the app itself (I wrote that app communication works both for iOS and Android.) The app declares support for audio in the UIBackgroundModes key in your Info.plist but we are unable to locate any features that require persistent audio. EULA (End User License Agreement) is missing for in-app purchases. After the rejection the app is no longer receiving these notifications. They are there, since the app receives them, when I open app, or significant location change is detected. It also works, when I run the app directly from Xcode (in debug mode), not from TestFlight nor in Sandbox. It seem to me like Apple somehow spoiled my background capabilities on purpose or accidentally. Is it possible? What can I do with it? Is it the case that I should just fix the review remarks and send the app back to review, and once the app passes it, it will work again? Or should I not count on it? Any suggestions? I asked Apple using: https://developer.apple.com/contact/topic/#!/topic/select but so far no response.
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179
Aug ’25
How can notification action buttons' text be center aligned?
The iOS documentation shows notification actions buttons with the text center aligned: https://developer.apple.com/documentation/usernotifications/declaring-your-actionable-notification-types But there's no apparent way for an app to control this. The buttons are controlled and rendered by the system and the text is always left aligned. Is there some way to get the text center aligned?
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86
Aug ’25
Notification Service Extension Not Triggering for Push Notifications on iOS
I have integrated a Notification Service Extension in my app to handle rich push notifications with images. The issue occurs on iOS 15 and iOS 18 devices—while the text content of the notification shows, the image is not displayed. However, the rich push notification works fine on other iOS versions (e.g. iOS 16, iOS 17) I’ve tried the following steps: Verified App Groups are the same for both the main app and the extension. Checked the "mutable-content" flag in the notification payload. Added a print statement in the NotificationService.swift to check if it’s running. It doesn’t appear in the Xcode logs. I’ve tried using Attach to Process in Xcode, but nothing happens. The app is installed on a real device, and I’m testing with push notifications when the app is in the background.
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200
Mar ’25
Audio Session in Notification Service Extension
Is there anyway that I could use AVAudioSession, AVAudioPlayer or anything similar in Notification Service Extension? I am trying to implement Audio Playback in the Notification Service Extension to play specific audio file when receiving Notification regardless the app state(foreground, background or killed), but I am not able to activate audio session in Notification Service Extension. NSError *sessionError = nil; BOOL success = [[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback error:&sessionError]; success = [[AVAudioSession sharedInstance] setActive:YES error:&sessionError]; if (!success) { NSLog(@"Error activating audio session: %@", sessionError); } Below is the error that I got when I am trying to run the code above in Notification Service Extension. Error Domain=NSOSStatusErrorDomain Code=561015905 "Session activation failed" UserInfo={NSLocalizedDescription=Session activation failed}
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156
May ’25
CarPlay notifications unsupported for Driving Task apps in iOS 18.6
I have my app configured as a Driving Task app with the entitlement and provisioning profile correctly set up. I am also requesting the ".carPlay" notification authorization option and setting up the carplay notification category with the ".allowInCarPlay" category, both without error. When testing with the iPhone and carplay simulators the user notifications I send are appearing on the phone but not in carplay. When I check the notification settings with UNUserNotificationCenter.current().getNotificationSettings() I see that carplay is shown to be not supported ("carPlaySetting: NotSupported"). The CarPlay Developer Guide 2025-06-09 (which is the version currently referenced in the Apple docs) states that "Starting in iOS 18.4, notifications are also supported in CarPlay driving task apps". Has this discrepancy been addressed anywhere, or is this an open issue? My software versions: MacOS: Sequoia 15.6 XCode: 16.4 iPhone Simulator: iPhone 16 with iOS 18.6
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Aug ’25
Push Live Activity not showing up
This is in an iOS Simulator running iOS 18.2 I send a start live activity push notification from the Push Notifications Console on icloud.developer.apple.com. When checking the console.log output it seems to receive the message, yet the activity does not appear in the dynamic island. (the app is backgrounded when I test this) Can anyone tell me why it's not showing? Starting the same activity from within the app using Swift code works fine. Here is the console.app output: default 11:01:59.060954+0100 apsd <APSConnectionServer: 0x104207b80; development/com.apple.aps.sessioncore.PushNotifications.dev/liveactivitiesd 0>: Sending push to client. UUID: (null) default 11:01:59.061012+0100 apsd Dispatching high priority message on server: <APSConnectionServer: 0x104207b80; development/com.apple.aps.sessioncore.PushNotifications.dev/liveactivitiesd 0> default 11:01:59.061770+0100 apsd Looking up connection on peer: 4304b50 found <APSConnectionServer: 0x104207b80; development/com.apple.aps.sessioncore.PushNotifications.dev/liveactivitiesd 0> default 11:01:59.062283+0100 liveactivitiesd APSXPCDeliverMessageEvent: Created APSIncomingMessage. UUID: (null) default 11:01:59.062642+0100 liveactivitiesd <APSConnection: 0x600003d18000> Delivering message from apsd: <APSIncomingMessage: 0x600000c2e9a0> 2897852514 com.****.****.push-type.liveactivity default 11:01:59.062763+0100 liveactivitiesd <APSConnection: 0x600003d18000> Delivering message from apsd. UUID: (null) default 11:01:59.063374+0100 liveactivitiesd <APSConnection: 0x600003d18000> making delegate (<SessionPushNotifications.APSPushConnection: 0x600000227460>) calls to deliver message 2897852514 { aps = { alert = { "loc-key" = "recording_started_message"; "title-loc-key" = "recording_started_title"; }; attributes = { isRecording = 1; }; "attributes-type" = SWAutomaticTripRecorderActivityAttributes; "content-state" = { distance = 0; }; event = start; timestamp = 1742374701; }; } for topic com.****.****test.push-type.liveactivity default 11:01:59.063440+0100 liveactivitiesd <APSConnection: 0x600003d18000> calling <SessionPushNotifications.APSPushConnection: 0x600000227460> connection:didReceiveIncomingMessage: default 11:01:59.063740+0100 liveactivitiesd Acquiring keep-alive with reason: Received message default 11:01:59.063785+0100 liveactivitiesd Keep-alive reasons: ["Received message": 1] default 11:01:59.063803+0100 liveactivitiesd <APSConnection: 0x600003d18000> returned from <SessionPushNotifications.APSPushConnection: 0x600000227460> connection:didReceiveIncomingMessage: default 11:01:59.063883+0100 liveactivitiesd <APSConnection: 0x600003d18000> responding with an ack for message with guid E19D7D04-12A0-4F1B-B33C-F6BF57EE2EFF default 11:01:59.063921+0100 liveactivitiesd <APSConnection: 0x600003d18000> responding with an ack. UUID: (null) default 11:01:59.063996+0100 apsd Looking up connection on peer: 4304b50 found <APSConnectionServer: 0x104207b80; development/com.apple.aps.sessioncore.PushNotifications.dev/liveactivitiesd 0> default 11:01:59.064019+0100 apsd <APSUserCourier 0x100f052a0 development 0> informed that <APSConnectionServer: 0x104207b80; development/com.apple.aps.sessioncore.PushNotifications.dev/liveactivitiesd 0> acknowledges incoming message with guid E19D7D04-12A0-4F1B-B33C-F6BF57EE2EFF tracingUUID (null) default 11:01:59.064063+0100 liveactivitiesd Received message: topic: Topic(unsuffixed: "com.****.****test"); channelID: nil; token: Optional(128 bytes); eventType: start(SessionPushNotifications.IncomingMessage.EventType.StartParameters(attributesType: "SWAutomaticTripRecorderActivityAttributes", attributesData: 20 bytes, inputs: [])) for environment: development default 11:01:59.064198+0100 liveactivitiesd Received push event for com.****.****test::pushToStart default 11:01:59.064232+0100 liveactivitiesd Adding push-to-start budget for com.****.****test::pushToStart default 11:01:59.064273+0100 liveactivitiesd Acquiring keep-alive with reason: Database default 11:01:59.064296+0100 liveactivitiesd Keep-alive reasons: ["Database": 1, "Received message": 1] default 11:01:59.064313+0100 liveactivitiesd Acquiring keep-alive with reason: Database default 11:01:59.064330+0100 liveactivitiesd Keep-alive reasons: ["Database": 2, "Received message": 1] default 11:01:59.064342+0100 liveactivitiesd Reduced budget for com.****.****test::pushToStart to: 9 default 11:01:59.064358+0100 liveactivitiesd Topic com.****.****test.push-type.liveactivity has remaining budget for pushToStart of 9 default 11:01:59.064369+0100 liveactivitiesd Topic com.****.****test.push-type.liveactivity has not used any budget for activity default 11:01:59.064436+0100 liveactivitiesd Scheduling wake to re-evaluate push subscription budgets at 2025-03-19 11:01:59 +0000 default 11:01:59.064547+0100 liveactivitiesd Earliest nonwaking date from task "Push server budget timeout expiration": 2025-03-19T12:01:59+01:00, finalWakeTarget: 2025-03-19T12:01:59+01:00 3599.999696 default 11:01:59.064593+0100 liveactivitiesd Earliest waking date from task "Push server budget timeout expiration": 2025-03-19T12:01:59+01:00, finalWakeTarget: 2025-03-19T12:01:59+01:00 3599.999651 default 11:01:59.064620+0100 liveactivitiesd Scheduling nonwaking task for: 2025-03-19T12:01:59+01:00 in 3599.999622s default 11:01:59.064659+0100 liveactivitiesd Scheduling waking task for: 2025-03-19T12:01:59+01:00 in 3599.999584s default 11:01:59.064671+0100 liveactivitiesd Acquiring keep-alive with reason: wake scheduling default 11:01:59.064692+0100 liveactivitiesd Keep-alive reasons: ["Database": 2, "Received message": 1, "wake scheduling": 1] default 11:01:59.064734+0100 liveactivitiesd Scheduling waking task for adjusted date: 2025-03-19T12:01:59+01:00 in 3599.999508s default 11:01:59.064768+0100 liveactivitiesd xpc_activity_register: com.apple.sessionkit.wake, criteria: dictionary default 11:01:59.064843+0100 liveactivitiesd Received pushToStart notification for com.****.****test::pushToStart default 11:01:59.064955+0100 liveactivitiesd Keep-alive reasons: ["Database": 2, "Received message": 1] default 11:01:59.064979+0100 liveactivitiesd Publishing event: timestamp: 2025-03-19 08:58:21 +0000; activityIdentifier: F432AB2F-1799-4437-B54B-6D9D70A0B260; eventType: start(SessionPushNotifications.PushEvent.EventType.ActivityStartParameters(attributesType: "SWAutomaticTripRecorderActivityAttributes", attributesData: 20 bytes, contentSourceRequests: [ActivityKit.ActivityContentSource.Request.push(request: ActivityKit.PushActivityContentSource.Request.push, target: ProcessDescriptor.Request("com.****.****test")), ActivityKit.ActivityContentSource.Request.process(target: ProcessDescriptor.Request("com.****.****test"))]))
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Mar ’25
Crash in Swift 6 when using UNUserNotification
After porting code to Swift 6 (Xcode 16.4), I get a consistent crash (on simulator) when using UNUserNotificationServiceConnection It seems (searching on the web) that others have met the same issue. Is it a known Swift6 bug ? Or am I misusing UNUserNotification ? I do not have the crash when compiling on Xcode 26 ß5, which hints at an issue in Xcode 16.4. Crash log: Thread 10 Queue : com.apple.usernotifications.UNUserNotificationServiceConnection.call-out (serial) As far as I can tell, it seems error is when calling nonisolated func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) I had to declare non isolated to solve a compiler error. Main actor-isolated instance method 'userNotificationCenter(_:didReceive:withCompletionHandler:)' cannot be used to satisfy nonisolated requirement from protocol 'UNUserNotificationCenterDelegate' I was advised to: Add 'nonisolated' to 'userNotificationCenter(_:didReceive:withCompletionHandler:)' to make this instance method not isolated to the actor I filed a bug report: Aug 10, 2025 at 2:43 PM – FB19519575
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Sep ’25
Questions for AlarmKit
We are so interested in AlarmKit which is presented at WWDC25. While we planning our app using AlarmKit, We had a few questions come to mind and were hoping you could provide some clarity. Please excuse the rather long list of questions, as we don't currently have a device available to test these features ourselves. System Actions Related Is there a limit to the number of alarms that can be scheduled using AlarmKit? Are alarms scheduled with AlarmKit persistent across device reboots? When an alarm is dismissed (either by swiping or pressing the power button), can our app detect this action and execute code in response? Can we control the behavior of the physical Lock Screen buttons when an AlarmKit alarm is active, for instance, to trigger a snooze action? Does AlarmKit function correctly during Do Not Disturb or Low Power Mode? What is the expected behavior when an alarm from our app (using AlarmKit) overlaps with an alarm from another app that also uses AlarmKit? Which one is going to get its priority? Thank you for your help. Sincerely
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246
Aug ’25
Is there a way to dynamically configure Actionable Notifications?
Hello, We are trying to implement Actionable Notifications on iOS via Remote Notifications. According to Apple’s official documentation (Declaring Your Actionable Notification Types), it is recommended to register notification categories at launch time. However, in our use case, the number of buttons and their actions in the Actionable Notification are determined at the time of the Remote Notification request. This means that we cannot predefine the categories at app launch but need to dynamically configure them based on the payload of the Remote Notification. Our Approach We are considering setting aps.mutable-content = 1 and using Notification Service Extension to modify the categoryIdentifier dynamically. Below is the JSON payload we plan to use for Remote Notifications: { "aps": { "alert": { "title": "New Message Received!", "body": "Check out the details." }, "category": "DYNAMIC_CATEGORY", "mutable-content": 1 }, "categoryData": { "id": "DYNAMIC_CATEGORY", "actions": [ { "id": "REPLY_ACTION", "title": "Reply", "options": ["foreground"] }, { "id": "DELETE_ACTION", "title": "Delete", "options": ["destructive"] } ] } } Questions: Can we dynamically configure Actionable Notifications based on the Remote Notification payload? If we set categoryIdentifier in Notification Service Extension’s didReceive(_:withContentHandler:), will users still see the correct action buttons even if the app is terminated? What is the recommended approach to dynamically configure Actionable Notifications at the time of receiving the Remote Notification, rather than at app launch?
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100
Mar ’25
AlarmKit FAQ
Here are some questions we received and answers: Q1: Is there a limit to the number of alarms that can be scheduled using AlarmKit? There is no set number as a limit, but this does not mean you can schedule a limitless number of alarms. Depending on device state, available resources, etc., the device may impose a limit, and restrict an app trying to schedule too many alarms simultaneously. When you hit a limit and not able to schedule more alarms, you will receive the maximumLimitReached error. Q2: Will the scheduled alarms persist after system or app events that may terminate an app, for example, a reboot, force quit, or app crash? Yes, all alarms are expected to persist regardless of app or device state changes, once they are successfully scheduled. Q3: Will alarms work if scheduled by an app that is hidden, or requires a passcode or Touch ID/Face ID to launch? Hidden or passcode required apps do not work with AlarmKit. Currently, any scheduled alarms by such apps will silently fail. Q4: When an alarm is dismissed (either by swiping or pressing the power button), can an app detect this action and execute code in response? What about force closed apps? When an alarm is dismissed, the stopIntent set in the AlarmConfiguration is called. Any code in the perform method of this AppIntent would execute. Q5: Is there a focus mode that AlarmKit cannot break through? No. AlarmKit alarms can break through all focus modes. Q6: What is the expected behavior when alarms from multiple apps overlap? Which one gets priority? Which alarm would get activated when multiple alarms are scheduled for the same time is non-deterministic. There is no way to guarantee which app or which alarm will "win". Q7: What do pressing the physical buttons do when an AlarmKit alarm is active? Any physical button that causes a reaction from AlarmKit will stop the currently alerting alarm. Q8: If there are multiple alarms active at one time, which ones do physical buttons interact with? Pressing a physical button will dismiss all currently alerting alarms Argun Tekant /  DTS Engineer / Core Technologies Change History: 2025-08-15: First posted
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Aug ’25